Publisher's Synopsis
Excerpt from Cape Astrographic Zones, Vol. 1: Catalogue of Rectangular Co-Ordinates and Diameters of Star-Images Derived From Photographs Taken at the Royal Observatory, Cape of Good Hope
IN one sense the Astrographic chart had its origin in some correspondence which took place between Admiral Mouchez and myself, beginning in December 1882, of which details will be found in the Introduction to Vol. I. Of the Cape Photographic Durchmusterung (cape Annals, Vol. III). This correspondence was resumed in 1886 when Admiral Mouchez forwarded to the Cape some stellar photographs taken at Paris with the new astrographic telescope, which, at his instigation and with his support, the brothers Henry had evolved and constructed. I then wrote to Admiral Mouchez, congratulating him and the brothers Henry on the very successful results attained, and suggested that the time had arrived when steps should be taken to make a systematic international effort to apply like instruments and methods to the complete mapping of the sky. Admiral Mouchez concurred, and I then suggested that an International Congress meeting at Paris seemed to Offer the only practical way of arriving at joint action. A circular letter was then addressed to the chief astronomers and scientific societies - to which the favourable response was unanimous and so cordial that Admiral Mouchez was enabled to issue invitations to astronomers, in the name of the Bureau des Longitudes, to attend a Congress to be held in Paris in April 1887.
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